Richard Alley: Perspectives on Limits to Growth / World on the Edge

We rely heavily on energy use, dominated by finite fossil fuels. We have high scientific confidence, based on solid physics, that burning most of the remaining fossil-fuel resource and releasing the carbon dioxide will cause large and long-lasting climate changes. Studies of societal and economic impacts typically indicate that such large climate changes will make…

Discovery Channel – Global Warming, What You Need To Know, with Tom Brokaw

Global warming is the rise in the average temperature of Earth’s atmosphere and oceans since the late 19th century and its projected continuation. Since the early 20th century, Earth’s mean surface temperature has increased by about 0.8 °C (1.4 °F), with about two-thirds of the increase occurring since 1980. Warming of the climate system is…

NASA: Arctic Ocean Currents Changed

The transpolar drift (purple arrows) is a dominant circulation feature in the Arctic Ocean that carries freshwater runoff (red arrows) from rivers in Russia across the North Pole and south towards Greenland. Under changing atmospheric conditions, emergent circulation patterns (blue arrows) drive freshwater runoff east towards Canada, resulting in freshening of Arctic water in the…

The Secret of El Dorado (The discovery of Biochar)

The Secret of El Dorado – programme summary In 1542, the Spanish Conquistador, Francisco de Orellana ventured along the Rio Negro, one of the Amazon Basin’s great rivers. Hunting a hidden city of gold, his expedition found a network of farms, villages and even huge walled cities. At least that is what he told an…

Runaway Climate – Extreme Greenhouse Effect

Publications by James E. Hansen pubs.giss.nasa.gov, his latest book is: Storms of My Grandchildren: The Truth About the Coming Climate Catastrophe and Our Last Chance to Save Humanity. Amazon.com Runaway climate change Runaway climate change describes a scenario in which the climate system passes a threshold or tipping point, after which internal positive feedback effects cause the climate to continue changing, even…